LINEDISC(9) | Kernel Developer's Manual | LINEDISC(9)

# NAME

linedisc, ttyldisc_add, ttyldisc_lookup, ttyldisc_remove — extensible line discipline framework

# SYNOPSIS

#include <sys/conf.h>

int
ttyldisc_add(struct linesw *disc, int no);

struct linesw *
ttyldisc_remove(const char *name);

struct linesw *
ttyldisc_lookup(const char *name);

# DESCRIPTION

The NetBSD TTY line discipline framework allows extensibility. Modules that need special line disciplines can add them as convenient and do not need to modify tty_conf.c. Line disciplines are now managed by a string, rather than number.

Once the framework has been initialized, a new line discipline can be added by creating and initializing a struct linesw and calling ttyldisc_add().

The following is a brief description of each function in the framework:

ttyldisc_add()
  Register a line discipline. The l_name field of the struct linesw should point to a string which is to be the symbolic name of that line discipline. For compatibility purposes, a line discipline number can be passed in no, but for new disciplines this should be set to -1.
ttyldisc_lookup()
  Look up a line discipline by name. NULL is returned if it can not be found.
ttyldisc_remove()
  Remove a line discipline called name and return a pointer to it. If the discipline cannot be found or removed ttyldisc_remove() will return NULL.

# SEE ALSO

tty(4)

# HISTORY

The linedisc functions were added in NetBSD 1.6.

# AUTHORS

The NetBSD extensible line discipline framework was created by Eduardo Horvath <eeh@NetBSD.org>.

November 1, 2000 | NetBSD 7.2